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I encounter with this problem.
When i install plugin there is not issue working fine, but when i enable Object Cache is error come and i’m not sure why.
What i did, turn off object cache, disable and remove litespeed cache, then i delete /wp-content/plugins/litespeed-cache, /wp-content/.litespeed_conf.dat and /wp-content/object-cache.php also i remove /wp-content/litespeed then i reinstall the plugin
Install the plugin again working fine, then i enable Object Cache and again the error not sure why.